Carbureter.



a citizen of the United States, and residing To all whom it may concern:

UNITED STATES PATENT 'OFFICEL y Y :moms F. mums, oF BROOKLYN, NEW Yonx, AssIeNonTo wILniAm'i-Iowann analsex; or NEW Yonx, N. Y. 1

CABBUBETEB.

Be it imo'wnihat i,.THoMig F. MCGUmE,

in the borough of Brooklyn, county of Kings, and State of New York, have invented. cer- .-tain newand useful'lmprovements in Carbureters, of which the following is afull and clear specification, y f

This invention relates to carbureters, and has for its primary object to provide an improved construction for carbureters, in which the supplyof fuel delivered into a mining chamber is controlled by regulating the pres sure in an auxiliar chamber through which a portion` of. the uel is passed on its way into the mixing chamber. In connection with said auxiliary chamber, means are provided for adjusting the prdssiires therein with respect to the pressures in the mixing chamber; i

Another object is to provide a simple, eilicient and durable construction whereby many of the roubles no met with in the l,use and adju ment of carbureters can be readily overcome.

Another object* is to provide an attachment of simple construction whichcan be 'installed in the mixing chambers of engines now in operation and byemeans ofwhich such engines can be much benefited.

r Other and further'objects will appear in the cla'uns, and specification, reference being had to the accompanying drawing, in

whichf- Figure 1 is .bureter provided -with my improvements,

,being show parts-being shown in elevation, and Fig. 2

is a transv rse sectionA of the same, parts in elevatioii. f a Referring more particularly to the drawings, the carbureter compiises a mixing chamber 1, witha depression in its lower' wall 2 formed with an annular wall.3 -within which is threaded a fuel inlet 4 provided with an inlet openin 5 and a flange -6 which positions it within t e annulus 3.f The up- ,per end of the inlet Lbis beveled to corre- -spond with the form ofthe lower.- end of a Y tubular member 7, which is provided with anib 8 which depends into the .inlet opening 5. YThe lower end of the tubular member 7 forms. with the inlet 4 a conical pssagew 'ay V9, leading from chamber. A variab e pressure chanthe inlet o ning 5 into the ber-10 is provided within the upper. end of Aconnected to the engine.

a longitudinal section of a car# Patented May 16, 1916.

Application tiled June 9, 1914. Serial No. 843,999.

the tubular member 7, which communicates with the inlet opening 5 by way of a tubu` lar passage 11 of relatively' small diameter. A similar tubular passage 12 extends transversely through the tubular member-7, intersecting with the variable pressure chamber 10 and the tubular assage `11. Tubular member 7 is threade into the upper wall 13 of the mixing chamber and ris rotatable on its axis to vary -the size of the passage 9.

For this purpose, the member 7 is rovided with a flange 14, by means of whic it may be turned. djacent the upper end of the variable pre 1 5, the inflow of air through which is reguembodiment shown in the drawings, the tubula member 7'extends vertically across the mixing chamber 1 and -intermediately of a -vertical branch 17 and a horizontal branch l8r either of which may be the end to be A shutter -valve 19 may be provided in the vertical branch and asimilar shutter valve 20 maybe provided in the horizontal branch for regulating e chamber 10 are air inlets vlated by a thumb screw 16. In the preferred the flow through said branches. A receptacle 21 for liquid fuel is connected to the carbureter,'providin a float chamber in open communication with the inlet openin 5., A`

'float 22 which operates a valve 23 re atively to aninlet opening 24, serves to regulate the liquid level in the receptacleA 21. As shown in Fig. 2,5111 resilient blade 26 is securedto l the upper wall of the carbureter to press against the-knurled fiange 14 so as to retain the member 7finbany position to which it may'- be adjusted. A. similar resilientlinger 27 is securedto the flange 14:and engages 'the thumb nut 25 on'the'upper end of screwu 16.

The operation of my improved carbliieter will now be understood and brieiy described is as follows:

At lower speeds of the engine, the depres- A sion in the mixing chamber is not sufficientV to vcause the fuel to vrise an appreciable height in tubular passage 11 for thereason that the amount of air which passes through thevariable pressure chamber 10 and into the mixing chamber 1 is relatively large.

The fuel in this case is entirely supplied by the main* nozzle 9. However, as the speed increases, the suction of the engine increases,

ica

with the result that the pressure within the chamber 10 decreases. Eventually the fuel rising in tubular passage 11 reaches tubular ing passage 12, where it mixes with thevair,

mixing chamber through the transverse pas sage 12. The depression being ,considerably greater in the mixing chamber 1' than in the chamber 10, fuel is drawn through the pas- 4sage 12 into the chamber 1 and is atomized during the operation'. The greaterthe degree of depression inthe mixing chamber l, the greater willbe the amount of fuel and air which is admitted` into the mixing cham- Aber through the passage 12; By means of this action, the so-called'compensating valve which has been much used on carbureters, can be eliminated, thus doing away with the inherent disadvantages of such compensatvalves. These compensating valves which may be either spring or gravity operated, will remain inactive until gravity or when they ordinarily openv all at once and generally cause either an over-rich or'too lean a mixture. 'In the device Shown in the drawings on the other hand, a gradual increase infuel and'auxiliary airis provided as the speed of the engine increases; so that a simple, efficient and automatic regulation of fuel and air is effected.

1. In a carbureter, a mixing chamber provided with a fuel inlet,VV a tubular' member projecting from a wall opposite to said fuel 40l ber and fuel hollow member being provi ed'lwith an air inlet and forming-ajpassagebetweenait and said fuel'inlet,vsaid tubular injember'frmirfg a variable-pressurefciambeix and havingnw a passage leadingljtherefrom intosaid fuel inletyan inlete neiextending from said variable presurefichamber into said mixing chambera dmeans for adjusting the size passage' between' said tubular mem- .inlet I 2. In a carbureter, a mixing chamberprovided waafgaiiiu-in1et, a; hollow member' Within said'g-mixin 45 chamber constitutinglva variable pressure c amber and having a passageway with an opening'disposed opposite to said fuel inlet, said hollow member being adjustably mounted-to 'vary the distance of said opening from the fuel inlet, and a. passage extendingA between said variablepressure chamber and saidmixin chamber, said inlet.

3. In a carbureter,a mixing chamber -pro-- Y vided with inlet and outlet ports at' opposite Y ends thereof, a oat chamber connected coming from above and discharges. into the thereto by a fuel inlet, and a hollow .air-

'vided'with a fuel inlet in its lower wall, 'said fuel inlet being provided with av main liozzle, a variable pressure air chamber-'of rela.- tvely large cross section disposed abovev said fuel inlet and a vertically idi'sposedfuel' passage of relatively small diameter extend' ing from said fuel inlet into said variable pressure chamber, sa'1 .djvariabl`e pressure `chamber being provided witl1"la,.po'rt.v disthe springpressure is entirely overcome;-

charging directly into said mixing chamber.l

5. In a cariiureter, a mixing chamberprovided with a fuel inlet projecting upwardly vvfrom its bottom wall, a tubular member depending from its upperwall and forming a. passage between it and said .fuel inlet, said tubular member having a variable pressure chamber, a passage leading therefrom into i said fuel inlet, and an inlet channel extending from said variable.V pressure chamber into said mixing chamber,{ said tubnlar member being threaded uinto tbe upper` wall. of said mixing chamber and rotatable on its axis to adjust the /size of thepaslsageway be.- tween it and said fuel inlet.

6. In a carbureter, a mixing chamber provided with a fuel inlet prbjecting upwardly from its bottom wall, a tubular member depending from its upperwall andlformi'ng a passage between it and "saidfuel inlet,'.said tubular Vmember having a variable pressure `chamber, a passage leading therefrom j.

said fuel inlet,and an inlet channel extending from said variable pressurech'amber vinto said' mixing chamber, said variable pressure chamber -having an inletl for air adjacentits upper end andi means forreg'ulating'the "size Voffvahe Ysfame, said tubular member being threaded into the upperiwall of said mixing chamber and rotatable on its. axis'to adjust the size of the passageway tween it and :said fuel inlet. THOMAS F. MCGUIRE.

Witnesses :A WM. Av. COURTLAND,

A. QfKNrsrrr. 

